Remote control for fluid motors



Sept. 22, 1931. SCOTT REMOTE CONTROL FOR FLUID MOTORS Filed Feb. 3, 1927 J L VU ill...

Invenfon Apr/ up 56077.-

EX M M010 $4M Armmvgrs.

Patented Sept. 22, 1931 UNITED STATES PATENT OFFICE ARTHUR SCOTT, OF CLEVELAND, OHIO, ASSIGNOR TO THE CLEVmAiND PNEUMATIC TOOL COMPANY, OF CLEVELAND, OHIO, A. CORPORATION OF OHIO REMOTE CONTROL FOR FLUID MOTORS Application filed February 3, 1927. Serial No. 165,658.

This invention relates to a remote control for fiuid motors, having reference particularly to means for reversing the direction of rotation of the power shaft of the motor by manipulation'at a point distant from the m0- tor itself.

Compressed air motors are sometimes employed for performing operations of various kinds in situations where the motor is not accessible to the operator, as for instance, where there are extremely hightem eratures. In

/ such cases, rendering it impossi le for the operator to approach the motor closely, the hand control ordinarily employed for starting, stopping and reversing the motor cannot be used. Furthermore, it is impractical to locate such a hand control at a distance from the motor, for the reason that any attempt to lead the exhaust to a point distant from the motor always results in strangling it, which reacts upon the power of the motor.

One object of the present invention, there fore, is the provision of a remote control for fluid motors acting through the motive fluid itself to change the direction of rotation of the motor.

Other objects, and objects relating to details of construction and economies of manufacture, will appear as I proceedwith the description of that embodiment of the invention which, for the purposes of the present application, I have illustrated in the accompanying drawings, in which i r Fig. 1 is a more or less diagrammatic view illustrating an air motor with my improved reversing valve attached thereto and with .pipe connections leading from the said valve to a manual control valve locatedat a distance from the motor;

Fig. 2 is a detail plan view showing a handle which may be employed in connection with the four-way valve;

Fig. 3 is a section taken diametrically through the reversing valve on a plane parallel to the plane of Fig. 1, and 1 Fig. 4 is a detail cross sectional view taken substantially on the line 1-4 of Fig. 3.

Similar reference characters refer to like parts throughout the views.

In the drawings, 10 represents areversible ond fluid passage 23, which terminates at the compressed air motor which may be of any desired internal construction so long as there is incorporated in it a fluid passage 11 and a fluid passage 12 connected with an annular passage 13, the two passages 11 and 12 acting V interchangeably as inlet and exhaust passages, depending upon the direction ofrota tion of the motor. Upon the motor drive shaft 14, I mount a pinion 15 which may be' caused to mesh with a gear or rack, not shown, upon the machine or apparatus desired to be actuated.

In one end of the motor casing is a threaded opening into which is screwed the threaded end of the casing member 18 of my automatic reversing valve. The central extension 19 of the casing is beveled on its end to fit into a beveled socket 20 in the motor and to form a fluid-tight joint therewith when the casing member 18 is threaded home. A look nut 21 helps to prevent these parts from becom-. ing loosened. The reversing valve casing or shell is provided with a fluid passage 22 which runs through the extension 19, and with a secend of the casing member outside the extension 19. When the parts are assembled, the passage 22 forms a continuation of the passage 11 of the motor and thepassage 23 opens into the annular passage 13 of the motor which connects with the passages 12 and 12'. In the motor there are passages 50 and 51 connecting respectively with passages 12 and 12'. A rotary valve 52 serves to connect at properly timed intervals the passage 11 and the passages 50 and 51 with the ports of the motor cylinders. The detailed arrangement of the internal passages connecting the rotary valve 52 with the cylinder ports, is not here illustrated as the present invention has nothing to do with the motorleonstruction per se, it being essential merely that the construction be such as to cause retersal of rotation when the valve mechanism, presently to be described, is operated to reverse the direction of flow in the passage 1-1 on the one hand and the passages 12 and 12 on the other hand.

At its opposite end the casing 18 is bored out to recelve with a'driving fit a barrel 24 in which is mounted to slide, a spool valve 25 1 valve.

having heads 26 and 27. As shown in Fig. 3, the barrel 24 has a pair of holes 28 and 29 near one end and a pair of holes 30 and 31 near the other end, the first pair opening into passage 23 and the second pair into passage 22. These holes are adapted to be covered by the heads 27 and 26 respectively of the spool The end of'the bore made for the insertion of barrel 24 is closed preferably by a hollow plug 32 which has a cavity 33 connected by four equally spaced holes 34 with an annular passage 35, the cavity 33 opening through a central bore 36 into the interior of the barrel 24. The cavity 33 is closed by a solid tapered plug 37.

The valve has a common exhaust port 38 and intake ports 39 and 40, the exhaust port 38 extending through the valve casing and through the barrel 24, the intake port 39 extending through the casing and making connectionwith the interior of the barrel 24 through an axial bore 41 in the casing, and

theintake port 40 opening into the annular passage 35 of the plug 32 a'ndthence by passages 34, 33 and 36 into the interior of the barrel 24. The port 38 opens, preferably, (lirectly to atmosphere. The intake ports 39 and .40 are connected by relatively long pipes .42 and 43, flexible or otherwise, to a valve 44 which acts to direct the motive fluid from supply pipe 45 to either of said pipes 42 and 43 or to out off communication between said pipe 45 and the motor. I have illustrated for this purpose a four-way valve with one port 46 opening to atmosphere, so that such slight pressure as might tend to remain in the inactive one of the pipes 42 and 43 can be quickly dissipated when the position of valve 44 is changed. It should be understood, however, that the detail construction of valve 44 is immaterial and may be varied to suit conditions. In Fig. 2 I have illustrated a control handle 47 the construction of which will be obvious from thedrawings, for conveniently operatfrom pipe 45 into pipe 43 and thence into intake port 39 and through bore 41, striking against head 27 of spool valve 25 shifting it to the left, as shown in Fig. 3, and holding it there while the motive fluid passes out through hole 29 into passage 23 and thence through passages 13 and 12 into the motor to drive the latter in the desired direction. The exhaust from the motor returns through motor passage 11 and valve passage 22 and flows through hole 30 into the barrel 24 and out through common exhaust port 38.

communication with the atmosphere through port 46 in valve 44. Motive fluid now flows through pipe 42, port 40, annular passage 35, and passages 34,33 and 36, striking against head 31 of thespool valve shifting it to the right to close off holes 29 and 30 and to open holes 28 and 31. The incoming fluid then flows through hole 31 and passage 22 into the motor passage 11, and the exhaust from the motor returns through motor passages 12 and 13 into valve passage 23 and through hole 28 to common exhaust port 38.

While I have described my invention with more or less particularity, I appreciate that changes in design and proportions can be resorted to without departing from the spirit of the invention, and I do not desire'to be bound by any limitations other than those included in the appended claims.

Having thus described my invention, what I claim is:

1. A reversible rotary fluid pressure motor having a reversing valve operated by fluid pressure, said reversing valve being arranged to be acted upon by the motive fluid passing to said motor, and means for causing fluid from a common source to take either one of two diflerent courses in approaching said reversing valve. 7

2. A reversible rotary fluid pressure motor having a remote controlled reversing valve adapted tobe shiftedby fluid pressure, said reversing valve being arranged to be acted upon by the motive fluid passing to said motor, and means for causing fluid from a common source to take either one of two different courses in approaching said reversing valve.

3. In combination, a reversible fluid pressure motor having interchangeable intake and exhaust passages, valve mechanism in juxtaposition with the motor containing two passages connected respectively with the said motor passages, said valve mechanism having two separate inlet ports for motive fluid and a common exhaust'port, a manual control valve, separate pipes extending 'from said inlet ports to said manual control valve, said valve being adapted to direct motive fluid into either of said pipes, said valve mechanism including means for connecting either of said valve passages to said common exhaust port when the pipe connected with the inlet port for the other passage is employed to carry motive fluid.

4. In combination,a reversible fluid pressure motor having interchangeable intake and exhaust passages, valve mechanism in matic means also connecting the remaining valve passage with the common exhaust port.

5. In combination, a reversible rotaryshaft fluid pressure motor having interchangeable intake and exhaust passages, valve mechanism in juxtaposition with the motor containing two passages connected respectively with the said motor passages, said valve mechanism having two separate inlet ports and a common exhaust port, said valve mechanism including means for selecting one or the other of said'valve passages as the intake passage, depending upon which of said inlet ports is employed, and for connecting the remaining passage with the common exhaust port, said means comprising conductors for the motive fluid passing to said motor and means remotely controlled for directing motive fluid to either of said ports.

6. In a reversible rotary shaft fluid pressure motor, a reversing valve comprising a casing having two fluid passages, a spool valve, a barrel therefor, said barrel having an exhaust port in the middle and an intake port at each end, said barrel having also a pair of longitudinally spaced holes therethrough near one end opening into one fluid passage and a .pair of similar holes near its other end opening into the other fluid passage, said spool valve being adapted to be shifted to one end of said barrel by motive fluid introduced at the other end, said shifting movement uncovering the inner hole at one end of the barrel and the outer hole at the other whereby one passage is connected to the active intake port and the other passage is connected to the common exhaust port.

7. In a valve mechanism of the class described, a spool valve, a barrel therefor, said barrel having an exhaust port at the middle and an inlet port at each end, said barrel also having in its side wall near each end a fluid intake hole and having an exhaust hole between each of said intake holes and the 'middle of the barrel whereby motive fluid enterscribed, a shiftable valve, a casing therefor, said casing having inlet ports at spaced points and an exhaust port at an intermediate point,

said casing having also near each inlet port a fluid intake hole and having an exhaust hole between each intake hole and the said exhaust port whereby motive fluid entering through either of said inlet ports will shift the said valve to one extreme of its motion in the direction of the other intake port, un-

covering the intake hole near the first named intake port and uncovering the exhaust hole on the opposite side of the exhaust port.

In testimony whereof, I hereunto afiix my signature.

ARTHUR SCOTT. 

